diff options
| author | Noralf Trønnes <noralf@tronnes.org> | 2015-03-17 16:07:48 +0100 |
|---|---|---|
| committer | popcornmix <popcornmix@gmail.com> | 2015-05-25 18:14:06 +0100 |
| commit | 833c2d598c0fbfe5c47d233cd4302e290d403c16 (patch) | |
| tree | 365ac638c2ea2efe629d385042b6afab4be24837 | |
| parent | ef724874a73fdecf9bcb98d7124ea751a9203891 (diff) | |
| download | linux-833c2d598c0fbfe5c47d233cd4302e290d403c16.tar.gz | |
dts: overlay: add generic support for ads7846
Add generic support for the ADS7846 touch controller.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
| -rw-r--r-- | arch/arm/boot/dts/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/boot/dts/ads7846-overlay.dts | 83 |
2 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile index dbcbedb33d00..ecdd3229b34f 100644 --- a/arch/arm/boot/dts/Makefile +++ b/arch/arm/boot/dts/Makefile @@ -13,6 +13,7 @@ ifeq ($(CONFIG_BCM2709_DT),y) RPI_DT_OVERLAYS=y endif +dtb-$(RPI_DT_OVERLAYS) += ads7846-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += ds1307-rtc-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += enc28j60-overlay.dtb diff --git a/arch/arm/boot/dts/ads7846-overlay.dts b/arch/arm/boot/dts/ads7846-overlay.dts new file mode 100644 index 000000000000..6a92cd1a9ffc --- /dev/null +++ b/arch/arm/boot/dts/ads7846-overlay.dts @@ -0,0 +1,83 @@ +/* + * Generic Device Tree overlay for the ADS7846 touch controller + * + */ + +/dts-v1/; +/plugin/; + +/ { + compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709"; + + fragment@0 { + target = <&spi0>; + __overlay__ { + status = "okay"; + + spidev@0{ + status = "disabled"; + }; + + spidev@1{ + status = "disabled"; + }; + }; + }; + + fragment@1 { + target = <&gpio>; + __overlay__ { + ads7846_pins: ads7846_pins { + brcm,pins = <255>; /* illegal default value */ + brcm,function = <0>; /* in */ + brcm,pull = <0>; /* none */ + }; + }; + }; + + fragment@2 { + target = <&spi0>; + __overlay__ { + /* needed to avoid dtc warning */ + #address-cells = <1>; + #size-cells = <0>; + + ads7846: ads7846@1 { + compatible = "ti,ads7846"; + reg = <1>; + pinctrl-names = "default"; + pinctrl-0 = <&ads7846_pins>; + + spi-max-frequency = <2000000>; + interrupts = <255 2>; /* high-to-low edge triggered */ + interrupt-parent = <&gpio>; + pendown-gpio = <&gpio 255 0>; + + /* driver defaults */ + ti,x-min = /bits/ 16 <0>; + ti,y-min = /bits/ 16 <0>; + ti,x-max = /bits/ 16 <0x0FFF>; + ti,y-max = /bits/ 16 <0x0FFF>; + ti,pressure-min = /bits/ 16 <0>; + ti,pressure-max = /bits/ 16 <0xFFFF>; + ti,x-plate-ohms = /bits/ 16 <400>; + }; + }; + }; + __overrides__ { + cs = <&ads7846>,"reg:0"; + speed = <&ads7846>,"spi-max-frequency:0"; + penirq = <&ads7846_pins>,"brcm,pins:0", /* REQUIRED */ + <&ads7846>,"interrupts:0", + <&ads7846>,"pendown-gpio:4"; + penirq_pull = <&ads7846_pins>,"brcm,pull:0"; + swapxy = <&ads7846>,"ti,swap-xy?"; + xmin = <&ads7846>,"ti,x-min;0"; + ymin = <&ads7846>,"ti,y-min;0"; + xmax = <&ads7846>,"ti,x-max;0"; + ymax = <&ads7846>,"ti,y-max;0"; + pmin = <&ads7846>,"ti,pressure-min;0"; + pmax = <&ads7846>,"ti,pressure-max;0"; + xohms = <&ads7846>,"ti,x-plate-ohms;0"; + }; +}; |